Is it possible for a city to be located at 115 degrees south latitude and 25 degrees west longitude.

No. 
90 degrees north is the north pole
90 degrees south is the south pole
Therefore nothing can be more north/south (have a latitude of more than 90 north/south) than the poles.

Ibelieve it's the pacific islands 

Lol why dont you actually do the work instead of have people do it for you. jk i do it too lol